[efficiency-improver] Monthly Activity 2026-08

[github-actions]

Activity for August 2026

Suggested Actions for Maintainer

No suggested actions at this time.

Energy Efficiency Backlog

Priority	Focus Area	Opportunity	Estimated Impact
LOW	Code-Level	TestExecutionManager MethodLevel parallel array-per-test in setup	One-time setup cost
LOW	Code-Level	TestContextImplementation.SanitizeName: Array.IndexOf per char	Only on first TestTempDirectory access
LOW-MEDIUM	Code-Level	Executable-condition analyzer (#10634) recursive walk	Compile-time/IDE-only, bounded by Roslyn's own incremental model — disposition: not a viable target
LOW	Code-Level	VideoProduction.cs ProducePerTestVideosAsync O(tests×segments) overlap scan	Runs once at end-of-run (cold path), not worth changing
LOW	Test Infra	test/Utilities/Microsoft.Testing.TestInfrastructure: regex-on-error-retry, tiny-collection LINQ, bounded retry-delete loops	All cold/low-frequency/negligible-scale; not worth a PR

Repo continues to be actively self-optimized by maintainers/Copilot coding agent. No new HIGH/MEDIUM opportunities identified this run — Microsoft.Testing.Extensions.AzureFoundry, Microsoft.Testing.Platform.AI, and Microsoft.Testing.Extensions.OpenTelemetry all reviewed, no genuine hot-path issues found (measurement/tag-forwarding code shows explicit prior optimization attention). Reviewed ~24 commits since last run — all maintainer/Copilot-authored feature/infra/dependency-bump/localization work, no new hot-path efficiency regressions spotted.

Discovered Commands

Command	Purpose
./build.sh	Full restore + build
./build.sh -test	Run unit tests
./build.sh -pack	Build + produce NuGet packages
./build.sh -pack -test -integrationTest	Full pipeline incl. acceptance tests

Performance runner: test/Performance/MSTest.Performance.Runner/. Nightly timing workflow: .github/workflows/perf-timing-nightly.yml (Phase 1 artifact collection + Phase 2 regression detection, merged via PR #10720).

Run History

2026-08-31 21:44 UTC - Run

• 🔍 Scanned Microsoft.Testing.Extensions.AzureFoundry, Microsoft.Testing.Platform.AI, and Microsoft.Testing.Extensions.OpenTelemetry (previously flagged priority areas) — no HIGH/MEDIUM opportunities; chat-client providers are cold/startup-only paths, OpenTelemetry measurement/tag-forwarding code already shows explicit prior optimization (untagged fast-path, array-reuse comments).
• 💬 Task 5: re-checked [RFC] Agent/LLM-efficient test output for Microsoft.Testing.Platform #8824 — new maintainer comment since last review (2026-07-14) was a state-reconciliation summary, not a new ask; no action needed from us. No other open efficiency/performance-labeled issues found needing comment.
• 🔧 Task 4: confirmed no open [efficiency-improver]-prefixed PRs — nothing to maintain.
• 📊 No new PR created — pure monitoring pass; reviewed ~24 commits since last run (2026-08-30), all maintainer/Copilot-authored feature/infra/dependency-bump/localization work, no new hot-path efficiency regressions or opportunities spotted.

2026-08-30 21:41 UTC - Run

• 🔍 Scanned src/Adapter/MSTestAdapter.PlatformServices (drift re-check since 2026-08-21) and test/Utilities/Microsoft.Testing.TestInfrastructure (first-time scan, 29 files) — no HIGH/MEDIUM opportunities; only LOW-priority cold/low-frequency items found (error-retry regex, tiny-collection LINQ, bounded retry-delete loops, dev-only debugger polling).
• 💬 Task 5: checked [RFC] Agent/LLM-efficient test output for Microsoft.Testing.Platform #8824 — no new comments since 2026-07-14, not re-engaged; no other open efficiency/performance-labeled issues found needing comment.
• 🔧 Task 4: confirmed all ~31 historical [efficiency-improver]-titled PRs are closed — no open PRs to maintain.
• 📊 No new PR created — pure monitoring pass; repo commit volume very low since last run (only dependency/localization/infra commits).

2026-08-29 22:12 UTC - Run

• 🔍 Scanned Microsoft.Testing.Extensions.Telemetry (OpenTelemetry) and MSTest.Analyzers (non-CodeFix analyzers) — no genuine HIGH/MEDIUM opportunities found; telemetry ingestion is already batched/async, analyzer symbol lookups already cached via ConcurrentDictionary.
• 💬 Task 5: no open efficiency/performance/energy-labeled issues found requiring comment.
• 🔧 Task 4: no open [efficiency-improver]-prefixed PRs exist — nothing to maintain.
• 📊 No new PR created — pure monitoring pass; repo commit volume very low since last run (1 commit, Cache generated acceptance test builds #10811 CI/build-cache infra, outside our focus areas).

2026-08-28 22:16 UTC - Run

• 🔍 Scanned Microsoft.Testing.Extensions.VideoRecorder (for similar O(n2) patterns near the recently-fixed pruning bug), the sole new commit a7ea9ab ("Authorize extension pipes for sandboxed test hosts"), and Hosts//ServerMode/ — no genuine HIGH/MEDIUM opportunities found.
• ✅ Confirmed our prior run's finding (VideoRecorder pruning O(n2)) was independently fixed by maintainer PR Cache failed-test windows during video pruning #10837 "Cache failed-test windows during video pruning" (merged 2026-08-28, resolves [efficiency-improver] Cache failed-test windows incrementally in VideoRecorderSessionHandler pruning #10823).

2026-08-26 22:33 UTC - Run

• 🔍 Reviewed ~53 commits since 2026-08-25: all maintainer/Copilot-authored feature/infra/dedup/localization/dependency-bump work; no new hot-path efficiency regressions spotted.
• 🔍 Scanned JUnitReport, GitHubActionsReport, and newly-split AzureDevOpsReport client — no genuine hot-path inefficiencies found.

2026-08-25 21:49 UTC - Run

• ✅ Resolved: issue [efficiency-improver] Add regression gating to nightly PlainProcess performance timing pipeline #10549 (Task 6's regression-gating proposal, open since 2026-08-10) closed via maintainer PR Add nightly performance regression detection #10720 "Add nightly performance regression detection".
• 🔍 Reviewed ~40 commits since 2026-08-24: all maintainer/Copilot-authored feature/infra/dedup/test work; no new hot-path efficiency regressions spotted.

2026-08-19 - Run

• 🔧 Created PR (draft, efficiency/cache-regex-matches): cache compiled Regex in Assert.MatchesRegex/DoesNotMatchRegex — ~300x per-call reduction (5.12μs → 0.016μs). Superseded by maintainer PR Cache regex assertion patterns safely #10661 with a more thorough FIFO-bounded cache.

2026-08-18 - Run

• 🔧 Created PR (draft, efficiency/trx-reparse-point-syscall): combined Directory.Exists+File.GetAttributes into one syscall in TRX reparse-point ancestor walk.> 🤖 Automated content by GitHub Copilot. Generated by the Efficiency Improver workflow. · auto · 105.3 AIC · ⌖ 3.82 AIC · ⊞ 20.5K · [◷]( · ◷)

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---

Closing out August — moving to a new September tracking issue since the month has rolled over.> 🤖 Automated content by GitHub Copilot. Generated by the Efficiency Improver workflow. · auto · 81.2 AIC · ⌖ 3.38 AIC · ⊞ 20.5K · [◷]( · ◷)

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[Evangelink]

Reviewed and cleared, the same way #10381 / #9604 were cleared by #10384.

First, a consolidation note: this issue and #10377 are both "Monthly Activity 2026-08". The 2026-08-01 run created #10377 and the 2026-08-02 run created this one instead of updating it, and the two carry different backlogs - each dropped two rows the other kept. #10377 is closed as a duplicate and its unique rows are merged into the list below, so nothing is lost.

Consolidated August backlog and disposition

Item	Disposition
OTel GetTestInitialInfo: Properties.OfType<TestMetadataProperty>() inside a yield iterator	Fixed in #10397
DynamicDataShouldBeValidAnalyzer: candidateMethods.Where(...).ToImmutableArray() per [DynamicData] attribute	Fixed in #10397
TerminalTestReporter.TotalTests: _assemblies.Values.Sum() "on every display refresh"	Won't fix - premise is wrong
OTel GetSuiteName walks the bag separately from SetResultDetails	Won't fix
TestExecutionManager MethodLevel parallel: Select(t => new[] { t })	Won't fix
CI output-byte-count health metric	Needs a maintainer decision, not a PR

What #10397 changes

GetTestInitialInfo walked the property bag three times per test on the OTel path - two SingleOrDefault<T>() calls plus OfType<TestMetadataProperty>(), the last of which materializes a TProperty[] purely to enumerate it once. It now uses the struct enumerator: one pass for the two singleton properties, one for the metadata. The metadata pass stays separate on purpose - those tags are emitted after the identifier and file-location blocks, and buffering them to collapse into a single pass would reintroduce exactly the allocation being removed. The duplicate-property detection SingleOrDefault gave for free is kept explicitly (matching the guards SetResultDetails already has right below it) and is now covered by tests; it is reachable, since PropertyBag only rejects duplicate property instances, not two distinct instances of the same type.

DynamicDataShouldBeValidAnalyzer.TryGetMemberCore scanned the members twice and allocated an ImmutableArray per attribute; a single switch now resolves the property, the first method and the more-than-one-method case in one pass. The backlog called this "compile-time only" - worth noting analyzers re-run on every keystroke in the IDE, so it isn't.

Why the other four are dropped

• TerminalTestReporter.TotalTests - the entry says the Sum() runs on every display refresh. It doesn't. TotalTests has no callers in src/ at all; the only references are in TerminalTestReporterTests. Progress rendering (TerminalTestReporter.Formatting.cs) and the summary (TerminalTestReporter.Summary.cs, TestDiscovery.cs) compute their own totals and never touch this property. There is no hot path here to optimize.
• OTel GetSuiteName - folding it into the SetResultDetails pass would require reordering _testCaseResultCount.Add relative to the span tagging (changing what is recorded when a malformed bag throws) and buffering the metadata/artifact properties. It is a non-allocating linked-list walk over a handful of properties, on an opt-in path. Not a good trade.
• TestExecutionManager MethodLevel Select(t => new[] { t }) - the queue element type is IEnumerable<UnitTestElement>, so dropping the one-element array means changing that type and the class-level branch next to it. One-time setup cost of one small array per test, on a path that then allocates a queue node per entry anyway.
• CI output-byte-count metric - infrastructure proposal; it needs a maintainer decision on what the metric is for and what it gates, not a speculative PR.

That leaves the August efficiency backlog empty.

Two process issues worth fixing in the workflow

1. Duplicate monthly issue (above). The August run should update the existing month's summary rather than open a second one; when it opens a second one it also silently drops backlog rows.
2. Malformed labels. This issue carries [efficiency] and [efficiency-improver] Monthly Activity 2026-08 #10377 carries [[efficiency]]; [perf-improver] Monthly Activity 2026-08 #10381 carries [performance] and [perf-improver] Monthly Activity 2026-07 #9604 carries [area/performance, type/automation] and performance. These come from a labels string being applied instead of a list. The repo has picked up 13 such junk labels across roughly 70 issue associations ([type/tech-debt], [type/tech-debt, type/automation], [type/automation, type/test-gap], [type/test-gap, [testing], [performance], [efficiency], [[efficiency]], [area/performance, performance, efficiency). I have removed them from the four improver tracking issues; the label definitions themselves still need deleting, which is a destructive repo-wide change I have left to a maintainer.

[github-actions]

2026-08-08 21:55 UTC - Run

• 🔍 Reviewed the only commit since last run (a6010ba, dependency/skills bump) — no efficiency-relevant hot-path code changes.
• ✅ Closed [efficiency-improver] Monthly Activity 2026-08 #10419 as a duplicate of this issue (canonical Monthly Activity 2026-08).
• 🔍 Noted existing measurement infrastructure: .github/workflows/perf-timing-nightly.yml collects nightly PlainProcess timing via MSTest.Performance.Runner on Windows+Linux, artifact-only (no regression gating yet) — a candidate for a future Task 6 follow-up if maintainers want automated regression detection.
• 📊 No new HIGH/MEDIUM opportunities found; energy efficiency backlog remains empty.

(Note: this run's update_issue quota was already used to close the duplicate #10419, so this run's summary is appended as a comment rather than a full body rewrite. The Suggested Actions item for closing #10419 can be removed on the next full body update.)

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